In some examples, an electronic device comprises a voltage supply circuit to provide a reference voltage usable to discharge pixels in a display device; and a scaler circuit coupled to the voltage supply circuit. The scaler circuit is to buffer first and second frames and dynamically control the voltage supply circuit to modify the reference voltage based on a frequency of the first frame differing from a frequency of the second frame.

An example method includes estimating, based on content to be displayed at a display of a mobile computing device at a future time, an amount of power to be used by the display at the future time; selecting, based on the estimated power level, a power converter of a plurality of power converters of the mobile computing device, each of the plurality of power converters optimized for a different output power range; and causing electrical power from the selected power converter to be supplied to the display at the future time.

A mobile terminal according to one embodiment is characterized by comprising: a display panel including active areas from which images are output; a first driver for controlling an image output from a first active area among the active areas; a second driver for controlling an image output from a second active area among the active areas; first data lines connected to the first driver to apply an image signal to the first active area; and second data lines connected to the second driver to apply an image signal to the second active area, wherein the first data lines and the second data lines may be provided in the active areas alternately in at least one area.

Provided is a SIMBO buck-boost inverting converter including: a power stage for receiving an input voltage to generate first and positive output voltages and a negative output voltage, the power stage including a plurality of switches and an inductor; a control circuit for generating a plurality of control voltages based on the first and the second positive output voltages, the negative output voltage and a current of the inductor; an energy generation and distribution circuit for generating a plurality of duty cycles based on the control voltages; and a logic control and gate driving circuit for generating a plurality of switch control signals for controlling the switches of the power stage based on the duty cycles; wherein the control circuit and the energy generation and distribution circuit feedback-control and adjust the duty cycles to adjust a balance between an input energy and an output energy.

A power circuit according to the present disclosure may include a multiplexer connected to a first power line and a second power line and selecting and outputting one of a first voltage supplied through the first power line and a second voltage supplied through the second power line. Further, the power circuit may include a first power circuit which generates a first driving voltage and a second driving voltage by using a voltage supplied from the multiplexer, recognizes whether there is the first voltage supplied through the first power line, and does not output the first driving voltage when the first voltage is not recognized.

A clock and voltage generation circuit includes a voltage generator which generates a first gate high voltage, a first gate low voltage, a second gate high voltage, and a second gate low voltage, a first level shifter which generates a first gate clock signal which swings between the first gate high voltage and the first gate low voltage in synchronization with a gate pulse signal, and a second level shifter which generates a second gate clock signal which swings between the second gate high voltage and the second gate low voltage in synchronization with the gate pulse signal. The voltage generator lowers the second gate high voltage to a voltage level of a kickback reference voltage in response to a kickback signal, and the first gate low voltage and the second gate high voltage are gate-on voltages, and the first gate high voltage and the second gate low voltage are gate-off voltages.

A display apparatus includes a display panel displaying an image based on input image data, a driving controller determining a low frequency driving mode and a normal driving mode based on the input image data, a gate driver outputting a gate signal, a data driver outputting a data voltage, and a power voltage generator outputting power voltages. The driving controller is configured to generate a writing frame in which data is written in a pixel of the display panel and a holding frame in which the written data is maintained without writing data in the pixel in the low frequency driving mode. The driving controller is configured to operate at least one of the driving controller, the data driver, and the power voltage generator in a power reducing mode during the holding frame.

A power voltage generator includes a voltage sensor and a power controller. The voltage sensor is configured to sense a first voltage in a first charge sharing period of a gate clock signal and a second voltage in a second charge sharing period of the gate clock signal. The power breaker is configured to disconnect a power based on the first voltage and the second voltage.

A reference voltage generation circuit is provided. The reference voltage generation circuit reduces a potential difference between a reference voltage less than a first data driving voltage and a data driving voltage, namely, the potential difference between a lower reference voltage and the data driving voltage is reduced. Therefore, the power loss of a voltage dividing module is reduced to prevent the problems of reduced reliability and reduced service life of a drive circuit board due to excessive internal temperature.

An arrangement for operating a diode array includes a plurality of LEDs. Each LED is assigned a respective sensor element which is configured to detect a characteristic value representative of a luminous flux of the respective LED. The arrangement also includes a respective supply input for providing a current for light-emitting operation of the respective LED. The arrangement further includes in each case a control unit which is coupled on the input side to the respective supply input and the respective sensor element and on the output side to the respective LED and is configured to control the current for light-emitting operation of the respective LED as a function of the corresponding characteristic value. The arrangement additionally includes a respective supply input for providing a current for light-emitting operation of the respective LED.